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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e7dc55092db0ebeea69b02529fd3b1e83149df4f5f462c7502d857af44d7f3' 
  AND token = 'MorbnMmm8aTEYCtsQl1gxOV0S47cr9Ax7Cou5QW4618=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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