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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3644ce644e66efcc7fa53b7e5e3d1e0b7d2ede6b3c0dbbf81e2724d1c882d8e' 
  AND token = '6DTeHLTKTLOsYBO6FX03M2HonKN8EWuycekiu2cPhFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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