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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba963e1cde5410c6f51e27aa5257c0833281d82f4da85488fd74ddbcfd5963d' 
  AND token = 'q6XiiGqYhH0EbVEd3Om13IsKsSjdr/7T4B4in96rQ3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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