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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be46fac9c9760289690e44cbfd1d98dec8e9c1669c4456aa2534d42750ff08e' 
  AND token = 'C4TV8dNX6vjq6yWg1YS0XcgRIcNTrXyhtmwWQHN2Ong=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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