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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a120e49cbd6ce74709a22263eeb9a52c11b9503052fdf08b6e6fac6c548c2f7' 
  AND token = 'Eh4bDvK4JV2vMvL9K86JZ4lqymuCeDD8rxwYtko50Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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