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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b7a32dcd23e2fdc523db43f94a5dc2989f9d9ef3cb2149874f5bbb0efe0a0af' 
  AND token = 'dUx5H+WpDjM4R1i9MHR7DRpUp/3fTEfT07393E29I9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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