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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8588029e0205bbc9f5be692024df8638eb2bb586105a260d305bb0a4edf2f5' 
  AND token = 'xOywX6ol0Xgo8eCluGd62xTch06KTHaOj1Bvx4Saf1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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