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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c760840ce6b1d181171a02b422f3eb683476c1e3c22447c4ee86a795f565b506' 
  AND token = 'QJTjblal+1qoLAtaqnBzIWv/nY0ACYko3Yq+m3y8U1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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