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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01982c2fed82e00b2d1512f7938fa69a0aa05b70df65d446980b99e70aaab81' 
  AND token = 'XQiECcvixVLpUR1/5IHeoD+2FMkxdWzzMcJ3SkVPAiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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