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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be4f6a27eb4e7f5e20f1a2df656e7c77c35af6756123f551d3cead751ba5b0df' 
  AND token = 'LBgFASiGKqBMr+1Zzbr0l84IyFEYuBB6HtXX9T1iN6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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