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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b90e562d76781ecb00846cfa286927ca83266910898f8ebd6584928eb2fe455' 
  AND token = 'ZypIqF1o/9z5GXO2lI+ZpSr6y+H6fPovW1BeY9ClczM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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