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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a04a69746e15fbbc01ab5a87b706837d8c1ae2a5ae846c8c013361f310cd85' 
  AND token = 'NIKu/4N/eKkPPP3p/Ua29d4j16Dzyl2Cs1R1Yvq8m3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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