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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869d0dd897ba2c57b66e6fdee1dada2f387f2c083cf60ac9b30ad7f50904fe46' 
  AND token = '5BSTit6PcGUPZsBB1CMTD+C4DM431D25qdn1fEzNMaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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