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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a7c96257a9db9c5f770b6a7eb3ba9d2ccc50e05a23b8bb9ae63cd15a0460092' 
  AND token = 'Rr9dNwHXuBOakuTZt3TV7AkI+5JVzfOplnrOECpcraE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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