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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92085294c102d7e92e882d025e05e386dbd7bd490afadeb209f98b00862a0fd' 
  AND token = 'IW6RxxvjR2y4VF/vZ31If+9GZXajfeX/Z/ieJ+oyJEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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