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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db06574e6eca4039db7bdd92c483889a626d88401c5c71c49fb158b5575e842b' 
  AND token = 'p1xbfc0RhHTDB6i38RpH/N20lQkbwyfPNmsnQau6vls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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