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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e923f735ec6e49e5e14e30e63399173285964018018392747deb05ba1adbed2' 
  AND token = 'kruRBcuCdekySGrdS0REijaBLIR6y7+7HXsvo5niqEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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