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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a584da8710a7e6282eb542ed814f3618947690d5f77c2c08207d68980ecd185b' 
  AND token = 'ZBkj6spd4hwZJ+ircnz1Gb3Wc0NqTDzl3fLP270UYM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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