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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8d3eab48b2d99d7684c5345f0a0335c9506669235e5b102d206cd237aac6ea' 
  AND token = 'mackhPyQU2n27oDNzIlNW7v6ftb/2Nfr6t2hx6EI77E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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