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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7587dc42864b3892d1dc9a84bb6e8634d080c16ea1a73d3284edae576bb1a75b' 
  AND token = '5CRTdehgFm7umseS6qCNwJx4JkVDE/LGeRRTuxb7ZsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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