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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '071c316b8dfa8ee77631767fe53936629c9d5b7e2fa325c96012b57d510723aa' 
  AND token = '/ZEY4NUksUpbJNzoD4R8gLcXGMcW4DNCdBA0WtB7Q9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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