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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27845237b2fa61ee53edea7a244de9cbfbe12c402657b077fadc3c55b6f4c59b' 
  AND token = 'gZXh3aT7w7JRKnrRUWjWTF9sstzWf2IzJbB0i7ydU4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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