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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55064217987882b73c72467edd985a18bac126a5e7e54515c916ff4234b4ccc7' 
  AND token = '8ok/d3tj41R+nFcVE73+Lm/6Roi6i+6s46VG0U0Lufk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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