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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e73a39f5eb492e9aa983f192afca234df7ed930579ee0015a2f6863bd3fad7e0' 
  AND token = 'v/1vf4uCsDKNXWxMBri9kimx4WeZCm8QlNCNk1QOM9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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