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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0b02505b57edaf6bd7f9f04f7ec54cf89c2826d3b88c74f71c2f60d5cefc7e1' 
  AND token = 'Mo62TqSRas2M3eEOyFfYEs/rlhsgeBywuuBi0xu0ZzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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