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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0ec513c679b2c5cd3b7af02b9c9ff3fd72197f60686e39fc3d776ea56dcf0e' 
  AND token = 'P15RP0wWOj1+4Y2zxX4YruTXAzxEoeixajGw6EYlLr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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