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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea416f64af0f692a54915b525e185a0c4ffe473af91c2e0705fc99ca3217c07' 
  AND token = 'w/gRkXI52PSqZUJtrwK2AHrQ3xLxfP4837I6tIAfw+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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