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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d113c27dd72f8a03437dad0db6deba064f4cdf8fe31aa8c04124fbae36f16f0' 
  AND token = 'FfUOLce/29heiPi3KSUXH1ceDOGTekR2ACV1pF+4bnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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