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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2ee2c3e0d20d7b87b35fe4de0f1c3288fa95a73bd1d69f6c976661b79d4a0a9' 
  AND token = '5ZAKzBb1HizKPFJWACsz3xUx35Yfm5662gldceG99V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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