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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6eeeb672d233f2cb689b72b0bc77313b3d3eeaf2983d8f7144eba11e288528' 
  AND token = 'mzBGsYKnPgNq+H99nWQKbGR1Sb3ZlMvnT9x1fG3e+Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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