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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1246ac74e5a83eb3f77d8ebd609da35977f70cdf195c38e7ec5d1acb97e3a6a2' 
  AND token = 'nx/tN5AnBuCEgUoJu6pyp82Bdcmj02l4AuJExDHkhew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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