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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3772977a7d648b87fa6e6c8a1f338725d0e8e9b713760b46958f5e74e7858a2a' 
  AND token = 'vr9aZ73nvBBHcQlsy9F70V+ROgNlvJaBmqqU1Rg1p7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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