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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c80ca7701c1d1aeebed88cb17dfa26aac746320f930e46d8ceb759db797678' 
  AND token = 'PUIC4tyqudFeHmO6o8JW6PWIplDHL9PEeqc2ECAjL4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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