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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce28bfbdc8ac68c3e7af4512bc2166438d0082cf459ab5f6b23b02b5aab06c12' 
  AND token = '/zDcJ4mni3SMjCZ75zHMXURR03UBLRe8gh9Il9d+C8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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