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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c0dc93ea8238893d86296d0ec92a0f095297f87a91672cdaf72b72badcc156' 
  AND token = 'n0Y7T7qGu8eG97upqVAl/rTB8s2FVv60u/J+BaTFDXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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