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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5846f0fce366811f302aad0929135a79d43866f7f0b0c52d3f34a1db54365403' 
  AND token = 'gYIR86srKcMrUtiA1oY7xdJ2DFP1tpvElFqidDl0mvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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