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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a7dee5d82003e39a2a9a24a2c117faa85e8469d295ee4c14619ca049b32f27d' 
  AND token = 'KXK0fE8NLuEWNrm0Vx7YsXVnrUyGtb7haW6vtWQAHAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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