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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a580b3ba404f3eb2dabb8e3eb053d406a78b6e4a34535b53af47b504c9465a3' 
  AND token = 'BWnUWoysvvzNe5/aYviDn8Le8HfjrsdR3L9mW3aozZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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