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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f8a6e4f4046c5a4c3d59d51f6634f9816a19dc633985c0e93168d6c5398acc' 
  AND token = '2H2AKVeFfbA64HLuz1f1vxNxCbcG9o7JrqQ1xgLvK3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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