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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b055e739b5c8da7979c0fd1a87cda2259eb167e3943dfd51791846792123497e' 
  AND token = '/Q8VMboJekdbUvAsij2CiHZzjv9Q0h+CWNGeSA+Ofic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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