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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb258a16443b7e479ac3dcc27c7a12c594256b8e6148f70a5bd5037c2cfb7165' 
  AND token = '5KExIFko6E81RoJSSiD/GVzN7Z/90Sh+ApNAGgAgAeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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