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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '067b807ae108033d5b0d5ab67f074f7e1b67a4b0cb0ba2a0eb76c578793535c8' 
  AND token = '+tgBjh0fzC2kbvDDRolq/WlRZPBSO66ZmAaDhAerJRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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