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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d54b07544e9a7055f84a61f62d663c9b1eb4e697f64fa854d88b90be314d94' 
  AND token = 'zcynXmtP6CW0M9XeEsIpWwARPm/bDAIMOs4vPbNaJmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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