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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b3f3db717cdf544caf06fe427d250616e5571dd0b332d0697b02ca6eb981547' 
  AND token = 'LLs8vsplnufa2b+xLwz9TW7HBQuNKTh1Ef+0mHNM5vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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