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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7fb3a48980930511b2d737823297295f704bbcecb2d2f0f9c2002b49531f453' 
  AND token = 'x8OSRXuHsm1g/wWI8cI2dPz3CSSg5QmrAAhdvZPS4UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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