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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02c089a9055274ba53f8722d1fca938a6d4dacd8727a42c050473e8e3f75ccf' 
  AND token = 'ze7kSccm7xayno0esfMNkX2KCGFKoMJMJ1Y11VFh+AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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