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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bccaebd51f98f83b6c687241017280d10da2613a09dc3ddc8ed5a27e0149ad84' 
  AND token = '4LMoipVGxkLEtB5sUUes5LphaHRORSKnGR3GoO39gSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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