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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c0e36e7e0f11c6d59eb9282ceb75ba7a88965325b2f57127c810bc99db7608' 
  AND token = 'qnQ/blIbfXhpC6+9v3BRJargPFRL7c2xE9aeIAY30mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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