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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969106d1950e950f9cfe84da33c1812bbcc33bc741a2a345ffe3cd7ceb2a5920' 
  AND token = 'ixusw65M3AufGwSQmu8yzhCozLbF+kVOTsptnn+nQ5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}