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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b195531a3b9509cb0a5e68eccb9d4b088ceac72888d28223484f33b4303f93' 
  AND token = 'IgHA/+PwnyHpe+4+rda5c3oRMxAHGKkfaAm66j/Z1AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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