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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902cee25d0b33053a2f25e5a4a95b345206d31dd4c26bd964b7be565cf466f2a' 
  AND token = 'GYCes8uog+FTOmaNw1apqQrx61xo8xpyngTz7b4d87c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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