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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6361475efe45a0b330ae2f6d8fcb862cc827f16bd484881a237515262d43104e' 
  AND token = 'q7DcqACeQd80FlgDW+rFeClr2E2ODaLd8GXinYy5r2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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