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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaec259dd56c95dfbd6153ddbde80b96cacedbef9c3a928ec732539717907b43' 
  AND token = '3gp43pmZwNBusa1i0BGHKCJuDH1h0Ijk11D+E9n2hS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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