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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b28b2492ee585536d85fcbd0ca1262c8cb43b0e8a91753f16734581464bc6ed' 
  AND token = 'CuAOe6NHFX0uawwoRG3jRBfhRRqP+Kl0/2MNmpmyk8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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