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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df7011630c51af32ee26083eb316d3c251602ba14a3e177ba442ca0cca9c58be' 
  AND token = 't6V/d0RHaO8s3JBRs/HwLcnZoPSjR/OCK9trp6dLHWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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