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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75ff6dd259f0d3335ed58e90b8997f5d6ede0c9f035e8add2287a5e3cce44797' 
  AND token = 'JOnvyErAPcNbgRFzzvT1LgrO3gKyl9a/bq3T1C3042I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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