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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6970e3e68e05606fb1b2478a1e244c5fc1ca6220eee32e0bb62707867508abb' 
  AND token = 'yJrFj2CoXVCFG4bG/q7rLs5QFin212AvXi9qtVCCEnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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